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On Wed, 13 Sep 2006 17:52:03 -0300 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> wrote: > When touch_nmi_watchdog() was added to inside the wait loop in > wait_for_xmitr()[1], where the long delays come from, a unneeded > touch_nmi_watchdog() call was left in the beginning of > serial8250_console_write() (introduced in > 78512ece148992a5c00c63fbf4404f3cde635016) and this patch reverts it. > > [1] http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm2/broken-out/tickle-nmi-watchdog-on-serial-output.patch > http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm2/broken-out/tickle-nmi-watchdog-on-serial-output-fix.patch > [2] http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=78512ece148992a5c00c63fbf4404f3cde635016;hp=0ad775dbba12de3b7d25f586efe81ad995ca75a7 > > Signed-off-by: Aristeu S. Rozanski F. <aris@cathedrallabs.org> > > --- mm.orig/drivers/serial/8250.c 2006-09-13 17:26:53.000000000 -0300 > +++ mm/drivers/serial/8250.c 2006-09-13 17:27:14.000000000 -0300 > @@ -2263,8 +2263,6 @@ > unsigned int ier; > int locked = 1; > > - touch_nmi_watchdog(); > - > local_irq_save(flags); > if (up->port.sysrq) { > /* serial8250_handle_port() already took the lock */ I disagree. If characters are flowing out at a rate which consistently exceeds one-per-ten-milliseconds, the touch_nmi_watchdog() in wait_for_xmitr() will never be called. Consequently a large interrupt-time write to the serial port (ie: sysrq-T with serial-console enabled) will cause the NMI watchdog to trigger. No? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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